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A Winnipeg expert in infectious diseases, Dr. Allan Ronald, said he was devastated to learn his friend and leading HIV expert Joep Lange, pictured here, was killed when a Malaysian plane was shot down over Ukraine Thursday. (BC Centre for Excellence in HIV/AIDS)

A Winnipeg expert in infectious diseases is grieving the loss of a friend who died in the Malaysian Airlines Flight MH17 crash.

Dr. Allan Ronald knew Joep Lange, a leading HIV expert from the Netherlands who pioneered access to key AIDS medicines in poor countries.